Defender 120-grain .308 Winchester bullets are displayed at the National Shooting Sports Foundation's 34th annual Shooting, Hunting, Outdoor Trade (SHOT) Show at the Sands Expo and Convention Center January 17, 2012 in Las Vegas, Nevada. The SHOT Show is the largest annual gathering of shooting professionals with more than 1,600 exhibitors and 30,000 attendees expected. (Ethan Miller/Getty Images)

Lee said military-grade ammunition such as hollow-point bullets “has no reason to be in our homes and on our streets.”

Cohen, who said she expects to introduce the proposals at the board’s Jan. 15 meeting, said it “is too easy to obtain and possess military-grade ammunition” that is “designed to expand and shred internal organs” of shooting victims.

San Francisco Mayor Proposes New Anti-Gun Violence Legislation

The proposals come in the wake of last week’s shooting spree that killed more than two-dozen people at an elementary school in Connecticut and “heightened everyone’s awareness” about the problems of gun violence, Lee said.

There have been 67 homicides in San Francisco this year compared to 50 at the same point in 2011, but gun violence in the city is down about 4 percent from last year, according to Suhr, who said he hoped the mayor’s proposals would further reduce the violence.

The chief acknowledged that, as currently proposed, the legislation would allow someone to make multiple purchases that total more than 500 rounds as long as one transaction did not reach that number.

“That’s a problem,” he said. “But there has to be a threshold and we’re setting it at 500.”

Lee earlier this week joined more than 750 mayors from across the country in sending a letter to President Barack Obama and Congress calling for comprehensive gun control reform.